Interesting research that explains why the ancient amphitheater at Epidaurus,
Greece, has such good acoustics. The corrugated surface of the stone seating
acts as a natural low cut filter.
http://www.ncbi.nlm.nih.gov/pubmed/17471718
The research was performed by Nico Declercq and colleagues from the Georgia
(USA) Institute of Technology, and published in 2007 in the journal Canadian
Acoustics.
"While a picture is worth a thousand words, a
sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
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